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栗叶螨俗称栗红蜘蛛,近几年河北板栗产区均有发生为害,尤其是五、六月份少雨干旱时比较严重。去年迁西县因栗叶螨危害致使板栗减产一至两成。最近调查一些产区,大部分栗树都有越冬卵。为确保今年板栗丰收,应及早作好防治准备工作。栗叶螨一年发生5至9代,多在1 至4年生枝条上越冬,其中以1 年生枝芽和粗皮分杈处较多。4月末和5月初开始孵化,一直到5月底,为害叶面,在叶脉附近形成一些群落。一般雌成虫可产卵40多粒,6至7月,卵、若虫和成虫同时出现。世代重
Chestnut spider mites commonly known as chestnut red spider, chestnut producing areas in Hebei have occurred in recent years, especially in May and June less severe drought. Qianxi County last year due to chestnut spider mite harm caused by one to two into a chestnut cut. A recent survey of some producing areas, most of the chestnut trees have winter eggs. To ensure a good harvest this year, chestnut should be well prepared for prevention and treatment. Chestnut spider mites occur 5 to 9 generations a year, mostly in 1 to 4 years old wintering branches, of which 1 year branch buds and bark bifurcation more. Incubation began in late April and early May until the end of May, damaging the foliage and forming some communities near the veins. Female adults can generally spawn more than 40 tablets, 6 to 7 months, eggs, nymphs and adults simultaneously. Generational weight